Googling “orange compressed gas cylinder” gave me results for both oxygen cylinders and propane canisters, so in this case probably propane. The implication is probably meant to be that it’s a bomb, but it’s hard to tell anything conclusively from this photo. The extra bits on top could just be an apparatus for refilling smaller containers, like for camp stoves or something.

Interesting, it doesn't look like any o2 tanks I'm familiar with nor does it appear to have any masks or anything that would indicate to me it is for medical use. Whatever it is it looks really out of place, is this in a medical facility? It almost looks like a school or something.